Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1992-11-17
1994-08-30
Hickey, R. J.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
320 14, 320 21, H02J 710
Patent
active
053433807
ABSTRACT:
An electronic device for effectively preventing time-varying current from passing through an electro-chemical cell or battery is disclosed. Time-varying current flowing in a circuit which includes the cell/battery is sensed externally to the cell/battery with a magnetically-coupled ac current probe thereby producing an induced time-varying signal. This induced signal is amplified to the level of the original time-varying current and applied to the cell/battery's terminals in phase-opposition to the original current. As a result, the component of time-varying current flowing in the cell/battery's external leads assumes an alternate path around the cell/battery and is effectively canceled within the cell/battery itself. Time-varying voltage across the cell/battery, which would normally result from time-varying current passing through its internal impedance, is likewise eliminated. Accordingly, measurements of the cell/battery's incremental parameters can be performed with the cell/battery "on line" without measurement errors due to spurious charger- and load-related signals. Additional applications of the disclosed device include reducing or eliminating ripple and crosstalk in batteries that are supplying voltage-sensitive equipment, and preventing plate deterioration caused by ac currents flowing through a cell/battery.
REFERENCES:
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patent: 5140269 (1992-08-01), Champlin
The Institute of Electrical and Electronics Engineers, Inc.; IEEE Recommended Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generating Stations and Substations; Mar. 9, 1987; pp. 7-15.
IEEE; Sheldon DeBardelaben; Determining The End of Battery Life; 1986; pp. 365-368.
IEEE; Feder et al.; Field And Laboratory Studies To Assess The State of Health Of Valve-Regulated Lead Acid Batteries: Part I--Conductance/Capacity Correlation Studies; 1992; pp. 218-233.
IEEE Vaccaro et al.; Internal Resistance: Hardbinger of Capacity Loss in Starved Electrolyte Sealed Lead Acid Batteries; 1987; pp. 128-131.
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